RFR: 2322: Notify when PR is ready for sponsor in GitLab

[Zhao Song]

On Mon, 8 Jul 2024 23:07:20 GMT, Zhao Song <zsong at openjdk.org> wrote:

> In [SKARA-2302](https://bugs.openjdk.org/browse/SKARA-2302), I tried to let the bot send an email notification about the "pr is ready for sponsor" comment.
> But today, I noticed that it only works in GitHub not works in GitLab.

Thanks for the review!

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PR Comment: https://git.openjdk.org/skara/pull/1674#issuecomment-2218123469